diff --git a/src/Api/AbstractApi.php b/src/Api/AbstractApi.php
index 5c81d6fd..6cf92c25 100644
--- a/src/Api/AbstractApi.php
+++ b/src/Api/AbstractApi.php
@@ -191,7 +191,18 @@ protected static function encodePath($uri): string
      */
     protected function getProjectPath($id, string $uri): string
     {
-        return 'projects/'.self::encodePath($id).'/'.$uri;
+        return $this->attachUri('projects/'.self::encodePath($id), $uri);
+    }
+
+    /**
+     * @param string $path
+     * @param string $uri
+     *
+     * @return string
+     */
+    private function attachUri(string $path, string $uri)
+    {
+        return '' != $uri ? "{$path}/{$uri}" : $path;
     }
 
     /**
diff --git a/tests/Api/AbstractApiTest.php b/tests/Api/AbstractApiTest.php
new file mode 100644
index 00000000..d92a50b7
--- /dev/null
+++ b/tests/Api/AbstractApiTest.php
@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Gitlab API library.
+ *
+ * (c) Matt Humphrey <matth@windsor-telecom.co.uk>
+ * (c) Graham Campbell <hello@gjcampbell.co.uk>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Gitlab\Tests\Api;
+
+use Gitlab\Api\AbstractApi;
+use Gitlab\Client;
+use Psr\Http\Client\ClientInterface;
+
+class AbstractApiTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->api = $this->getTestApi();
+    }
+
+    /**
+     * @test
+     */
+    public function shouldNotHaveTrailingSlashForEmptyUri(): void
+    {
+        $expectedString = 'projects/1';
+
+        $this->assertEquals($expectedString,
+            $this->api->getProjectPath($id = 1, $uri = '')
+        );
+    }
+
+    /**
+     * @test
+     */
+    public function shouldHaveTrailingSlashIfProvidedInUri(): void
+    {
+        $expectedString = 'projects/1/commits/';
+
+        $this->assertEquals($expectedString,
+            $this->api->getProjectPath($id = 1, $uri = 'commits/')
+        );
+    }
+
+    protected function getTestApi(): TestApi
+    {
+        $httpClient = $this->getMockBuilder(ClientInterface::class)->getMock();
+        $client = Client::createWithHttpClient($httpClient);
+
+        return new TestApi($client);
+    }
+
+    protected function getApiClass(): void
+    {
+    }
+}
+
+class TestApi extends AbstractApi
+{
+    public function getProjectPath($id, string $uri): string
+    {
+        return parent::getProjectPath($id, $uri);
+    }
+}
diff --git a/tests/Api/ProjectsTest.php b/tests/Api/ProjectsTest.php
index bc7e64e0..6def3b0d 100644
--- a/tests/Api/ProjectsTest.php
+++ b/tests/Api/ProjectsTest.php
@@ -2780,7 +2780,7 @@ public function shouldUploadAvatar(): void
         $api = $this->getApiMock();
         $api->expects($this->once())
             ->method('put')
-            ->with('projects/1/', [], [], ['avatar' => $fileName])
+            ->with('projects/1', [], [], ['avatar' => $fileName])
             ->will($this->returnValue($expectedArray));
         $this->assertEquals($expectedArray, $api->uploadAvatar(1, $fileName));
         \unlink($fileName);